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Cool It! is the new card game from the Union of Concerned Scientists that teaches kids about the choices we have when it comes to climate change—and how policy and technology decisions made today will matter. Cool It! is available in our online store.

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Rising above the Sun's chromosphere , the temperature jumps sharply from a few tens of thousands of kelvins to as much as a few million kelvins in the Sun's outer atmosphere, the solar corona. Understanding...more

Sunspots are dark, planet-sized regions that appear on the "surface" of the Sun. Sunspots are "dark" because they are colder than the areas around them. A large sunspot might have a temperature of about...more

When the temperature in the core of a star reaches 100 million degrees Kelvin fusion of Helium into Carbon occurs. Oxygen is also formed from fusion of Carbon and Helium together when the temperature is...more

A plot of the binding energy per nucleon vs. atomic mass shows a peak atomic number 56 (Iron). Elements with atomic mass less then 56 release energy if formed as a result of a fusion reaction. Above this...more

There are several experiments where nuclear fusion reactions have been achieved in a controlled manner (that means no bombs are involved!!). The two main approaches that are being explored are magnetic...more

In the Hydrogen bomb the explosion of a nuclear fission charge (atomic bomb) produces the temperature and density so fusion can occur. This fusion results in a sudden release of a large amount of energy...more